| 摘要 |
PROBLEM TO BE SOLVED: To provide a high strength spheroidal graphite iron castings, which have as-cast: high strength satisfying the tensile strength of >900 MPa; and high ductility satisfying the high ductility of≥3%, further which have excellent wear resistance, and in which chilling in a thin part with a thickness of≤10 mm is prevented. SOLUTION: The high strength spheroidal graphite iron castings have a composition comprising, by mass, 3 to 4% C, 1.8 to 3.5% Si, 0.2 to 2% Mn, 0.003 to 0.03% S, 0.05 to 1% Nb, 1.4 to 4% Cu and 0.015 to 0.07% Mg, further comprising one or two selected from 0.05 to 0.4% Mo and 0.05 to 0.6% V, or further comprising≤0.5% Ni, and the balance Fe with inevitable impurities. In this way, the high strength spheroidal graphite iron castings combining the tensile strength of >900 MPa and the tensile strength of≥3% as-cast, further having excellent wear resistance, and free from the generation of chilling in a thin part can be obtained. It is preferable that, as the impurities, the content of P be regulated to <0.04%, and the content of Cr be regulated to <0.1%. Further, <0.03% Ti and <0.1% W are allowable, and also, <0.05% Al, <0.05% REM, <0.002% Ca, <0.002% Ba and <0.02% Bi are allowable. COPYRIGHT: (C)2009,JPO&INPIT
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